BA 157 cancelled right as I boarded the first leg
Flying from Prague to JFK on a 6:50a flight with a connection in LHR to arrive at 1p. At 6:40 I receive an email from BA saying the flight from LHR to JFK was cancelled and rerouted me on an another connection through Amsterdam.
Since I had no way to review options I was stuck with what LHR and AMS had. If I knew earlier I would’ve cancelled altogether and rebooked something else.
What kind of compensation am I entitled from this? There were a million other flights and they gave me one that gets in 7 hours later. After being up from 3a czech